3.3 Data collection
The primary data collection instrument is interview schedule. The schedule will be prepared and administrated to Thai Airways officers /managers. The first part of schedule is about the business performance profit. The second past is on marketing and operations management. Question about possible problem encountered will be on the last part. Because the interview schedule was made by the researcher, its validity and the reliability are not needed. However, for the sake of relevancy of question the researcher will seek the help of expert in the airline business.